As I recall, if you don't have brakes on the trailer you are legally only allowed to pull 750kg total. Hence lighter trail = greater payload. On the other hand heavier trailers may be better built and so last longer. What is your payload?
When looking at a trailer think about rust. Galvanising is great but it adds weight. What you want to avoid is overlapping pieces that water can get trapped between. The most likely places are where the sides meet the frame and where the floor sits on the frame. All panels should be butt-welded onto the frame. My father's last trailer was built like this and kept well painted and >20 years later it still looks like a 2 year old.
If you are going to tarp it then well placed tie bars will make life more comfortable. Many trailers have these too close to the top lip and it is difficult to pass a spool of rope through them. If the bars are down at floor height then you have the space to get a tarp made that overlaps the sides and can still be tied down. You need tie bars on the front and back as well as the sides.
Personally, the idea of putting a scope in a trailer with its basic suspension gives me the heeby jeebies. Are you sure you don't want shock absorbers or a tandem trailer??
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